Threadlinqs IntelligenceStart free

ATT&CK techniqueCommand and Control

T1571 Non-Standard Port

Command and ControlEnterprise

As of 2026-10-05, T1571 (Non-Standard Port) appears in 215 tracked threats, first reported 2021-11-25 and most recently 2026-10-03, with linked actors including APT38, Sapphire Sleet, Stardust Chollima; it most often appears alongside T1027 (Obfuscated Files or Information).

Tracked threats
21565 critical, 141 high, 9 medium
First seen
2021-11-25
Last seen
2026-10-03
Threat actors
67In the threats using it
Detection rules
372Blue tier and above

Data as of:

Activity timeline

T1571 first appeared in tracked threats on and was most recently reported on . The busiest month was 2026-07 with 76 reports, and 214 of the 215 threats were reported in the twelve months to 2026-10.

How adversaries use it

T1571 Non-Standard Port is catalogued by MITRE ATT&CK under the Command and Control tactic in the Enterprise matrix. Threadlinqs maps 215 of 2623 tracked threats (8.2%) to it; by severity that is 65 critical, 141 high, 9 medium.

Threats that use T1571 most often also use T1027 Obfuscated Files or Information (159 threats), T1082 System Information Discovery (154 threats), T1041 Exfiltration Over C2 Channel (130 threats), T1005 Data from Local System (128 threats), T1105 Ingress Tool Transfer (122 threats). These are the techniques an intrusion set tends to chain with it, so they are the natural next places to look when it is observed.

67 tracked threat actors appear in the threats that use T1571; the most frequent are APT38 (10), Sapphire Sleet (10), Stardust Chollima (9), UNC1069 (8), Contagious Interview (7).

Mitigations

MITRE ATT&CK lists 2 mitigations for T1571.

Data sources

Telemetry that can reveal T1571, per MITRE ATT&CK.

  • Network Traffic — Network Traffic Content, Network Traffic Flow

Threat actors using it

Tracked threats

The 30 most recent of 215 tracked threats that use T1571.

Detection coverage

Threadlinqs maintains 372 detection rules mapped to T1571 (SPL 153, KQL 102, Sigma 117). Rule content is available to Blue tier accounts and above; this page shows counts only.

372 detection rules (SPL/KQL/Sigma) · Blue and above. Compare plans